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1、4242-80 B 4853703 0033836 b r International Standard 4242 F-2 3 -2.5 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEKRYHAPOHAfl OPTAHMJAUHR no CTAHflAPTH3AUMH.ORGANISATlON INTERNATIONALE DE NORMALISATION Cinematography - Recording head gaps for two sound records on 16 mm magnetic film - Positions
2、and width dimensions Cinmatographie - Entrefers de ttes denregistrement pour enregistrement du son sur deux pistes sur film magntique de 16 mrn - Emplacement et largeur First edition - 1980-07-01 UDC 681.84.083.82 : 78.534.4 Ref. No. IS0 4242-1980 (E) Descriptors : cinematography, motion picture fil
3、m 16 mm, magnetic recording, sound recording, sound track, magnetic heads, dimensions, positioning, specifications. Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04
4、/25/2007 20:49:25 MDTNo reproduction or networking permitted without license from IHS -,-,- 4242-80 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing Inter- national Standards is ca
5、rried out through IS0 technical committees, Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Dr
6、aft International Standards adopted by the technic.al committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 4242 was developed by Technical Committee ISO/TC 36, Cinematography, and was circulated
7、to the member bodies in May 1979. It has been approved by the member bodies of the following countries : Austria Italy Sweden Belgium Japan United Kingdom Canada Libyan Arab Jamahiriya USA Czechoslovakia Mexico USSR Denmark Poland Yugoslavia France South Africa, Rep. of Germany, F. R. Spain No membe
8、r body expressed disapproval of the document. This International Standard cancels and replaces IS0 Recommendations R 890-1968 and R 891-1968, of which it constitutes a technical revision. O International Organization for Standardization, 1980 Printed in Switzerland I4853903 0033B17 8 I- C. Copyright
9、 International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:49:25 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD - 7 i m 7 0 3 003laLB T r IS0 424
10、2-1980 (E) 4242-80 Cinematography - Recording head gaps for two sound records on 16 mm magnetic film - Positions and width dimensions 1 Scope and field of application 5 Velocity This International Standard specifies the lateral positions and 5.1 The sound records are intended for use at velocities o
11、f width dimensions of the recording heads for two magnetic 24 perforations (approximately 18,3 cm or 7.2 in) per second or sound records and a control track on 16 rnm single perforated at 25 perforations (approximately 19,05 cm or 7.5 in) per magnetic recording film. second. It also specifies the re
12、producing velocity of the film travel. 2 References IS0 69, Cinematography - 16 mm motion-picture raw stock film - Cutting and pedorating dimensions. IS0 1188, Cinematography - Recording characteristics for magnetic sound record on 16 mm motion-picture film - Specifications. 3 Location and width of
13、magnetic head gaps 3.1 The width dimensions and lateral positions of the magnetic head gaps shall be as shown in the figure and given in the table. 3.2 The magnetic head gaps shall be physically in line at an angle of Wo f 5 to the direction of film travel. 4 Recorded characteristic The recorded cha
14、racteristic shall be in accordance with IS0 1188. 5.2 The tolerances given in IS0 1188 (clause 3) permit a choice of operating conditions such that the recorded characteristic conforms to IS0 1188 even though the recording is intended for either 24 or 25 perforations per second, and the reproduction
15、 is conducted at the other velocity. 6 Track usage 6.1 The centre track position shall preferably be used for single records. However, for international exchange, inter- changeability is facilitated by placing identical information on both tracks. 6.2 For recording stereo programmes, the centre trac
16、k position shall be used for the left-hand channel. 6.3 For recording two languages, the centre track shall be used for the primary language and the edge track position shall be used for the secondary language. 6.4 mation and for address systems in analogue or digital form. The control track shall b
17、e used for recording other infor- 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:49:25 MDTNo reproduction or networking permitted without license from IHS -,-,- Direction o
18、f film travel The magnetic coating is on the upper surface of the film as indicated on the figure. Shaded areas on recorded areas and not stripes. ! I I - Recording head gaps in line Centre line of control +* I I Centre line of recording i_ recording head gap I- head gap Centre line of edge recordin
19、g head gap Figure - Magnetic sound records and head gaps Table - Dimensions of sound records and head gap widths Dimension 2,05 f 0,05 0.081 f 0.002 5,95 f 0,05 0.234 f 0.002 13,45 f O,& 0.529 f 0.002 l E I Freference) I 15.95 I 0.628 1 The inch dimension C deviates from the standard conversion prac
20、- tice to reflect the practices in those countries where that system is used. 2) To prevent the erase head overlapping the film edge, a dimen- sion of 3,8 - o o,1 mm (0.150 - :.w in) is preferred in some countries. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:49:25 MDTNo reproduction or networking permitted without license from IHS -,-,-